Joe McKnight, once the top recruit in the nation and a standout running back at USC, was killed in a shooting on Thursday near his hometown in Terrytown, Louisiana.

McKnight, 28, had a four year NFL career and was playing in the Canadian Football League this season for the Saskatchewan Roughriders. He was shot and killed in a dispute at an intersection in Terrytown, a New Orleans suburb, at around 3 p.m. CT.

Most learned of McKnight's death on Thursday evening and many former teammates, current Trojans, friends and Louisiana natives in the football world took to Twitter to mourn his killing.

Cardinals defensive back and Louisiana native Tyrann Mathieu:

Former USC running back Reggie Bush:

Former Jets teammate Antonio Cromartie:

The New York Jets:

Miami Dolphins wide receiver and Louisiana native Jarvis Landry:

Former Jets teammate Damien Woody:

Former USC safety Su'a Cravens:

Current USC star Adoree' Jackson:

Chiefs teammate Tamba Hali:

USC and New York Jets legend Keyshawn Johnson:

Current LSU linebacker and former John Curtis High School standout Duke Riley:

New Orleans Saints running back Mark Ingram:

USC coach Clay Helton:

LSU coach Ed Orgeron:

Rams running back Todd Gurley: